CVE-2026-6784

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Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150 and Thunderbird 150."}, {"lang": "es", "value": "Errores de seguridad de memoria presentes en Firefox 149 y Thunderbird 149. Algunos de estos errores mostraron evidencia de corrupci\u00f3n de memoria y presumimos que con suficiente esfuerzo algunos de estos podr\u00edan haber sido explotados para ejecutar c\u00f3digo arbitrario. Esta vulnerabilidad fue corregida en Firefox 150 y Thunderbird 150."}], "id": "CVE-2026-6784", "lastModified": "2026-10-26T21:10:00.170", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 5.9, "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-6784", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-04-22T03:56:17.140808Z", "version": "2.0.3"}}]}, "published": "2026-04-21T13:16:24.020", "references": [{"source": "security@mozilla.org", "url": "https://bugzilla.mozilla.org/buglist.cgi?bug_id=1536243%2C1745382%2C1851073%2C1893400%2C1963301%2C2001319%2C2002899%2C2012436%2C2014435%2C2016901%2C2019916%2C2020486%2C2020612%2C2020817%2C2021788%2C2022051%2C2022367%2C2022431%2C2023302%2C2023670%2C2024225%2C2024238%2C2024240%2C2024265%2C2024367%2C2024369%2C2024424%2C2024760%2C2025281%2C2025361%2C2025387%2C2025466%2C2025954%2C2025958%2C2026278%2C2026292%2C2026297%2C2026378%2C2027148%2C2027287%2C2027341%2C2027384%2C2027427%2C2027694%2C2027993%2C2028009%2C2028270%2C2028416%2C2028524%2C2029295%2C2029699%2C2029800%2C2029801"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2026-30/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2026-33/"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/security/cve/CVE-2026-6784"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460084"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6784.json"}], "sourceIdentifier": "security@mozilla.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}, {"lang": "en", "value": "CWE-416"}, {"lang": "en", "value": "CWE-787"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-787"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{"bugzilla": {"description": "Firefox: Thunderbird: Firefox and Thunderbird: Arbitrary code execution via memory safety bugs", "id": "2460084", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460084"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["A flaw was found in Firefox and Thunderbird. These memory safety bugs could lead to memory corruption. With sufficient effort, an attacker could potentially exploit these issues to execute arbitrary code, gaining unauthorized control over the affected system."], "name": "CVE-2026-6784", "public_date": "2026-04-21T12:41:13Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-6784\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-6784\nhttps://bugzilla.mozilla.org/buglist.cgi?bug_id=1536243%2C1745382%2C1851073%2C1893400%2C1963301%2C2001319%2C2002899%2C2012436%2C2014435%2C2016901%2C2019916%2C2020486%2C2020612%2C2020817%2C2021788%2C2022051%2C2022367%2C2022431%2C2023302%2C2023670%2C2024225%2C2024238%2C2024240%2C2024265%2C2024367%2C2024369%2C2024424%2C2024760%2C2025281%2C2025361%2C2025387%2C2025466%2C2025954%2C2025958%2C2026278%2C2026292%2C2026297%2C2026378%2C2027148%2C2027287%2C2027341%2C2027384%2C2027427%2C2027694%2C2027993%2C2028009%2C2028270%2C2028416%2C2028524%2C2029295%2C2029301%2C2029461%2C2029699%2C2029800%2C2029801\nhttps://www.mozilla.org/security/advisories/mfsa2026-30/"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[150,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Firefox", "source": "cna", "vendor": "Mozilla"}, "product": "firefox", "vendor": "mozilla"}], "analysis": {"en": {"generated_at": "2026-04-22T06:47:25.910944+00:00", "value": {"mitigation_remediation": ["Upgrade Firefox to version 150 or later, ensuring the update includes the memory\u2011corruption fixes.", "If you use Thunderbird, upgrade it to version 150 or later for the same protection.", "Enable automatic updates for Firefox so that security patches are applied promptly.", "If an upgrade is not immediately possible, run the browser in a sandboxed environment to limit the impact of potential exploits."], "summary": {"action": "Immediate Patch", "impact": "Arbitrary code execution"}, "threat_synthesis": {"affected_systems": "Mozilla\u2019s Firefox version 149 is affected. The vulnerability was addressed in Firefox 150, which is the earliest safe release. No detailed patch version data was provided beyond this milestone. If Thunderbird users are affected, the corresponding fix is also in version 150, and Thunderbird is included in the official CNA vendor/product list.", "description_and_impact": "Memory safety bugs in Firefox 149 and Thunderbird 149 were updated in the description to specify that these bugs involve memory corruption, such as use\u2011after\u2011free, double\u2011free and out\u2011of bounds writes (CWE\u2011125, CWE\u2011416, CWE\u2011787). The wording still indicates that, with sufficient effort, an attacker could trigger arbitrary code execution, thereby compromising confidentiality, integrity, and availability of the affected system. The likely attack vector remains the processing of external content (web pages, downloads or email), consistent with the original entry, though the exact attack path is not detailed in the CVE.", "risk_and_exploitability": "The CVSS score of 7.5 indicates a high severity level. EPSS data is not available, so the precise exploitation probability cannot be quantified, but the non\u2011listing in CISA\u2019s KEV catalog suggests that no active exploitation has been reported yet. Nonetheless, the combination of memory corruption weaknesses and the browser\u2019s privileged execution context poses a significant risk if the vulnerability is exploited."}}}}, "created": "2026-04-21T16:30:40.490597+00:00", "updated": "2026-04-22T07:00:12.119881+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox"]}